A container made of thermoplastic material, including a body that extends between a neck and a base that is able to withstand, without significantly deforming, a hydrostatic pressure caused by the column of a liquid contained in the container, the column of liquid being increased by a pressure not exceeding 2×105 Pa. The base includes main ribs in the form of grooves that are open towards the outside and extend approximately radially, passing through an annular zone that forms an approximately flat seat by way of which the base can rest in a stable manner on a flat support. The main ribs extend upwards on a wall connecting the base to the body of the container. The container has a shoulder that forms a joining zone between the connecting wall and the body of the container, and the main ribs extend upwards beyond the shoulder.